着丝点是染色体的主缢痕，在这个地方姐妹染色单体连在一起。
Centromere is the primary constriction on the chromosome, a region at which the sister chromatids are held together.
这时每条染色体已是由两条染色单体构成了。
方法：采用小鼠精原细胞姐妹染色单体交换实验。
Methods: the sister chromatid exchange (SCE) test in mice spermatogonia was used in the study.
在粗线期每条染色体实际已由两条染色单体组成。
Each chromosome in pachytene actually have been composed of two chromatids.
探讨影响姐妹染色单体互换(SCE)频率的因素。
To investigate the incidence of sister chromatid exchange (SCE) and its influencing factors.
随着染色体的复制，着丝粒始终连接着形成的两个染色单体。
Following the replication of chromosomes resultant chromatids remain attached at the centromere.
方法：蚕豆、大麦和人外周淋巴细胞姐妹染色单体交换（SCE）。
Methods:Sister chromatid exchange(SCE) was sued in human lymphocytes and plant root tip cells.
此时每条染色体由一对染色单体构成，这两条联合的染色体称为四分体。
At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.
双线期时，配对的染色单体开始从四分体中分离，此时常可见染色体交叉。
In diplotene the pairs of chromatids begin to separate from the tetrad formed by the association of homologous chromosomes.
用姊妹染色单体互换(SCE)技术检测23例恶性肿瘤患儿的染色体稳定性。
Chromosomal stability were detected in 23 children with malignancy by the technique of sister chromatid exchange (SCE).
静脉采血检测染色体畸变、姊妹染色单体交换（SCE）、细胞微核的发生率。
The mean frequencies of chromosome aberration (CA), sister chromatid exchange (SCE), and micronucleus(MN) were analysed.
作者应用外周血姐妹染色单体交换率(SCE)技术估价多菌灵a的致突变作用。
The authors used technique of sister chromosome exchange (SCE) to assess the effect on mutation with BCMA.
染色体的主缢痕，使姐妹染色单体连在一起，在其两侧各有一个由蛋白构成的动粒。
Centromere --- The primary constriction on the chromosome, a region at which the sister chromatids are held together and at which the kinetochore is formed.
结果表明：DCAP是一种染色体损伤剂，诱发的畸变主要为染色单体断裂和交换；
Results showed that DCAP was clastogen and the aberrations were mainly chromatid breaks and exchanges.
结论体外姐妹染色单体互换试验可推荐作为一项检测口腔材料潜在致突变性的体外评价方法。
Conclusion it is recommended that sister chromatid exchange test is an effective in vitro detecting method for mutagenicity of dental materials.
在终变期配对的同源染色体中的姐妹染色单体完成分离，染色体变成紧密凝集的状态，缩至最小长度。
During diakinesis the sister chromatids of homologous pairs of chromosomes complete their separation and the chromosomes coil tightly shortening and thickening.
推测副缢痕附近异染色质的DNA重复序列可能是在进化过程中通过染色单体不均等交换而逐渐形成。
It is presumed that the repeated DNA sequences of the heterochromatin near the secondary constriction might be formed gradually in the process of evolution through unequal SCEs.
它能引起细胞染色单体断裂，增加sce的频率，其SCE频率的出现与克隆形成能力的抑制呈平行相关。
It could induce formation of cellular chromatid breaks and increase the frequency of SCE. The effect of HCPT on SCE was found to parallel to the inhibition of colony formation.
在结构上，染色体型断裂、染色单体型断裂、双着丝粒、双微小体这些畸变，差异也非常显著（P<0.01）。
Structurally, the aberrations of the chromosome-type break, chromatid break, double minute chromosome were also remarkably different (P<0.01).
本文对饮酒组28例、对照组22例的外周血淋巴细胞姐妹染色单体互换、核仁形成区和随体联合进行了观察、统计。
The paper makes an observation and statistical study of 28 cases in drinking group and 22 cases in control group with peripheric blood of lymphatic sister chromatid exchanges (SCE).
采用孕妇外周血淋巴细胞姐妹染色单体交换（SCE）技术，检测巨细胞病毒（CMV）抗体阳性孕妇淋巴细胞DNA损伤和修复。
We applied the sister chromatid exchange (SCE) technique to pregnant women with antibodies against cytomegalovirus (CMV) positive, to detect the lesion and repair of DNA in the lymphocytes.
结果64%的卵细胞核型正常，36%的卵细胞为非整倍体，其中22%为同源染色体不分离，14%为姐妹染色单体非平衡性过早分离。
Results 64% of oocytes were normal, 36% of oocytes were aneuploidy, of which 22% were due to nondisjunction and 14% unbalanced predivision.
目的与方法：单细胞凝胶电泳技术(SCGE)、姐妹染色单体交换法(SCE)和染色体畸变分析法均能被用来检测dna的损伤或修复。
Purpose and methods: Single cell gel electrophoresis (SCGE), sister chromatid exchanges (SCE), chromosome aberrations are three methods to determine DNA damage and repair.
赭曲毒素A通过诱导DNA链的断裂、姐妹染色单体的互换、DNA加合物的形成或者活性氧发挥作用，但是作为一种毒素其作用机制仍然没有被解决。
Ochratoxin a may act by induction of DNA strand breaks, sister chromatid exchanges, DNA adduct formation, or reactive oxygen but the mechanism of action as a toxin is not yet resolved.
研究发现，SO_2及其衍生物可引起人外周血淋巴细胞、小鼠骨髓细胞、中国仓鼠肺成纤维细胞等哺乳动物细胞的染色体畸变、姊妹染色单体交换及微核的形成。
Several studies have shown that SO2 and its derivatives could induce chromosomal aberrations, sister chromatid exchanges and micronuclei in human blood lymphocyte, bone marrow cell in mice and CHL.
在后期双著绿点染色体将形成一个桥，无著绿点染色体单体形成一断片，此两者均可记录下来。
At anaphase the dicentric chromatid will form a bridge and the acentric a fragment, both of which can be scored.
PD涂料染色粘合剂是由软单体含量较高的核和硬单体含量较高的壳组成。
The pigment binder PD is composed of a nucleus with softer monomer content and a shell with harder monomer content.
考察了一种以丙烯酸乙酯为第二单体的新型腈纶的热性能和染色性能。
Dyeing properties and thermal performance of a novel PAN fiber with ethyl acrylate as the second monomer were discussed.
有证据表明，这些片段可能代表羚牛染色体着丝点的卫星DNA单体。
It also suggests that these BamHI fragments may represent repeat units of the centromeric satellite DNA of takin.
植物单体或双体异附加系是重要的遗传材料，在基因定位、物理图谱构建及染色体工程育种上具有十分重要的作用。
Monosomics and disomics additional lines of plants are the important materials in gene location, physical mapping and chromosome engineering breeding.
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